Somatoform Dissociation

Abstract

In most of the recent scientific and clinical literature, dissociation has been equated with dissociative amnesia, depersonalization, derealization, and fragmentation of identity. However, according to Pierre Janet and several World War I psychiatrists, dissociation also pertains to a lack of integration of somatoform components of experience, reactions, and functions. Some clinical observations and contemporary studies have supported this view. Somatoform dissociation, which can be measured with the Somatoform Dissociation Questionnaire (SDQ-20), is highly characteristic of dissociative disorder patients, and a core feature in many patients with somatoform disorders and in a subgroup of patients with eating disorders. It is strongly associated with reported trauma among psychiatric patients and patients with chronic pelvic pain presenting in medical healthcare settings. Motor inhibitions and anesthesia/analgesia are somatoform dissociative symptoms that are similar to animal defensive reactions to major threat and injury. Among a wider range of somatoform dissociative symptoms, these particular symptoms are highly characteristic of patients with dissociative disorders. The empirical findings reviewed in this article should have implications for the contemporary conceptualization and definition of dissociation, as well as the categorization of somatoform disorders in a future version of the DSM.     

Reliability and Validity of the Turkish Version of the Structured Clinical Interview for DSM–IV Dissociative Disorders (SCID-D): A Preliminary Study

A total of 34 consecutive patients with dissociative identity disorder or dissociative disorder not otherwise specified were evaluated using the Turkish version of the Structured Clinical Interview for DSM–IV Dissociative Disorders (SCID-D). They were compared with a matched control group composed of 34 patients who had a nondissociative psychiatric disorder. Interrater reliability was evaluated by 3 clinicians who assessed videotaped interviews conducted with 5 dissociative and 5 nondissociative patients. All subjects who were previously diagnosed by clinicians as having a dissociative disorder were identified as positive, and all subjects who were previously diagnosed as not having a dissociative disorder were identified as negative. The scores of the main symptom clusters and the total score of the SCID-D differentiated dissociative patients from the nondissociative group. There were strong correlations between the SCID-D and the Dissociative Experiences Scale total and subscale scores. These results are promising for the validity and reliability of the Turkish version of the SCID-D. However, as the present study was conducted on a predominantly female sample with very severe dissociation, these findings should not be generalized to male patients, to dissociative disorders other than dissociative identity disorder, or to broader clinical or nonclinical populations.     

Somatoform and psychoform dissociation among students

Recent evidence suggests a relationship between psychoform and somatoform dissociation both in clinical and non clinical samples. The aim of the study was to investigate the association between the two forms of dissociation among 947 university students who completed two self-administered questionnaires, the Somatoform Dissociation Questionnaire (SDQ-20) and the Dissociative Experience Scale (DES). The main result of the study was that the association between somatoform and psychoform dissociation was strong for individuals with moderate level of DES scores (O.R.=7.0), but much stronger for individuals with high level of DES scores (O.R.=18.9).     

Somatoform and psychoform dissociation among women with orgasmic and sexual pain disorders

Since the 20th century, psychogenic female sexual dysfunctions (FSD), like some somatoform and conversion disorders, have been considered an expression of somatoform dissociation. Several studies have reported dissociative symptoms in different somatoform and conversion disorders, but limited data are available on dissociation among patients with FSD. The aim of this study was to assess somatoform and psychoform dissociation among patients with women's orgasmic disorder, dyspareunia, and vaginismus. A battery of self-administered questionnaires (Somatoform Dissociation Questionnaire, Dissociative Experiences Scale, Hospital Anxiety and Depression Scale, Impact of Event Scale-Revised) was given to 200 gynecological outpatients to assess psychoform and somatoform dissociation and their association with FSD. A strong association between somatoform dissociation and FSD was observed (adjusted odds ratio [OR] = 5.39, 95% confidence interval [CI] = 1.15-25.32), the association between somatoform and psychoform dissociation being estimated by an adjusted OR of 4.83 (95% CI = 1.17-19.91). Our results are compatible with the idea that some forms of FSD could be regarded as somatoform dissociative disorders.     

Psychoform and somatoform dissociation and PTSD in deaf adults

Both deafness and dissociation disconnect people from certain aspects of the external environment. Dissociation among the deaf population has been largely neglected as an area of scientific investigation. The purpose of this study was twofold: first, to examine the psychometrics of 2 dissociation measures--the Dissociation scale of the Trauma Symptom Inventory (TSI) and the Somatoform Dissociation Questionnaire-20 (SDQ-20); and second, to evaluate the relationship between dissociation and posttraumatic stress disorder (PTSD) in deaf adults. A diverse sample of 79 deaf adults was assessed using the Clinician-Administered PTSD Scale, the TSI, and the SDQ-20. Results provided support for the concept of psychoform dissociation, as measured by the TSI Dissociation scale, in deaf adults. However, somatoform dissociation, as measured by the SDQ-20, showed lower internal consistency. The SDQ-5, a shortened version of the SDQ-20, was unreliable in the current sample. Deaf adults were significantly higher on psychoform dissociation than the norm samples of hearing adults. As in hearing samples, dissociation--both psychoform and somatoform--was significantly related to PTSD symptoms. In addition, those with dissociative PTSD displayed significantly more symptoms of depression, anger, impaired self-reference, tension reduction behavior, and somatoform dissociation than did the nondissociative PTSD group.     

Discriminating Dissociative Identity Disorder from Schizophrenia and Feigned Dissociation on Psychological Tests and Structured Interview

ABSTRACT

Objective: The purpose of this study was to evaluate the relative efficacy of a number of psychological tests and interviews in discriminating dissociative identity disorder (DID) from feigned dissociation and schizophrenia.

Method: Three measures of dissociation (SCID-D, DES, SDQ-5) two personality measures (MMPI-2, Millon-III) and a brief measure of hypnotic susceptibility (Spiegel & Spiegel's Eye-Roll Sign) were assessed for their ability to differentiate these diagnostic groups.

Results: Results indicate that the SCID-D was clearly the most efficacious instrument in discriminating DID from schizophrenia and from feigned dissociation. The DES-Taxon and the SDQ-5 were adequate in screening pathological dissociation from schizophrenia but were less discriminative of feigned dissociation. The commonly used personality inventories were unable to detect feigned dissociation and the DID group tended to have higher elevations on scales measuring psychotic symptoms than did the schizophrenic group. The Eye-Roll Sign discriminated feigned dissociation from those with dissociative disorders.

Conclusions: Structured interviews such as the SCID-D, although resource consuming, are essential in comprehensive assessment of dissociative disorders. Comprehensive assessment of psychotic disorders should include some measure of dissociation.     

The Axis-I Dissociative Disorder Comorbidity of Borderline Personality Disorder Among Psychiatric Outpatients

ABSTRACT

The aim of this study was to determine the frequency of dissociative disorders among psychiatric outpatients with borderline personality disorder (BPD). In order to ascertain the extent of the overlap between two diagnostic groups, the overall prevalence of both disorders were evaluated. Two hundred and forty (240) consecutive patients who presented to a university outpatient psychiatry unit were screened using the self-report questionnaire version of the BPD section of Structured Clinical Interview for DSM-III-R Personality Disorders (SCID-II), the Dissociative Experiences Scale (DES) and the Somatoform Dissociation Questionnaire (SDQ). One hundred and twenty-nine (129) participants who had a score above the cut-off point on at least one of these instruments were evaluated using the interview version of the BPD section of the SCID-II, the Dissociative Disorders Interview Schedule (DDIS), and the PTSD module of the Structured Clinical Interview for DSM-III-R (SCID-I). All participants who were diagnosed as having BPD or a dissociative disorder were evaluated then with the Structured Clinical Interview for DSM-IV Dissociative Disorders (SCID-D). Twenty-five (25; 10.4%) participants had BPD and 33 participants (13.8%) had dissociative disorder in the final evaluation. Sixteen participants (64.0%) with BPD had the Axis I diagnosis of a dissociative disorder; all six participants (2.5%) with dissociative identity disorder were among them. The findings demonstrate that a significant part of psychiatric outpatients who fit the criteria of BPD have a DSM-IV dissociative disorder on Axis I. The presence of dissociative symptoms as a part of BPD should not lead to overlooking the possibility of a co-occurring dissociative disorder.     

Dissociation following traumatic medical treatment procedures in childhood: a longitudinal follow-up

Chronic illnesses often involve repeated hospitalization and invasive treatment procedures that can have a traumatic impact on child development. To explore possible consequences of treatment procedures, three groups of patients with congenital anomalies were examined longitudinally. At first admission, adolescents (ages 10-20, mean 15) with anorectal anomalies (n = 14), adolescents with Hirschsprung disease (n = 14), and hospitalized controls (n = 14) were assessed for treatment procedures, somatic function, mental health, and dissociative experiences. The assessment included the Adolescent Dissociative Experiences Scale (A-DES). At 10-year follow-up, the patients completed the Dissociative Experiences Scale (DES) and the Somatoform Dissociative Questionnaire (SDQ-20). Anal dilatation, an invasive medical treatment procedure performed daily by the parents the first 4 years, was correlated with the frequency and severity of persisting dissociative symptomatology. The procedure was the only significant predictor of A-DES and SDQ-20 scores, and one of two significant predictors of DES scores. This "experiment of nature" permitted a specific and unique opportunity to examine the impact of early traumatic exposure on child development in the absence of parental malevolence, and on later dissociative outcome in adolescence and adulthood. The findings might be valuable theoretically to our understanding of the development of psychopathology, and may lend itself for comparison with data on sexually abused children.     

The Multidimensional Inventory of Dissociation (MID): A Comprehensive Measure of Pathological Dissociation

ABSTRACT

This article describes the development and validation of the Multidimensional Inventory of Dissociation (MID). The MID is a 218-item, self-administered, multiscale instrument that comprehensively assesses the phenomenological domain of pathological dissociation and diagnoses the dissociative disorders. The MID measures 14 major facets of pathological dissociation; it has 23 dissociation diagnostic scales that simultaneously operationalize (1) the subjective/ phenomenological domain of pathological dissociation and (2) the hypothesized dissociative symptoms of dissociative identity disorder (Dell, 2001a). The MID was designed for clinical research and for diagnostic assessment of patients who present with a mixture of dissociative, posttraumatic, and borderline symptoms. The MID demonstrated internal reliability, temporal stability, convergent validity, discriminant validity, and construct validity. The MID also exhibited incremental validity over the Dissociative Experiences Scale (DES) by predicting an additional 18% of the variance in weighted abuse scores on the Traumatic Experiences Questionnaire (TEQ). Confirmatory factor analysis (CFA) did not support a one-factor model of the MID's clinical scales (i.e., the 14 facets and the 23 diagnostic symptoms). In contrast, however, CFA of the MID's factor scales (Dell & Lawson, 2005) has strongly supported a one-factor model. It was concluded that both the MID's 168 dissociation items and the construct of pathological dissociation have a second-order, unifactorial structure.     

Psychoform and Somatoform Dissociation in a Clinical Sample of Australian Adolescents

Psychoform dissociation has been researched more than somatoform dissociation. The Somatoform Dissociation Questionnaire (SDQ-20), a commonly used adult measure of somatoform dissociation, is increasingly being used with adolescents internationally. We compared psychoform and somatoform dissociation in a mixed clinical adolescent sample. A total of 71 adolescents (12–18 years old) attending Australian community mental health and counseling services completed the SDQ-20 and the Adolescent Dissociative Experiences Scale, a commonly used measure of adolescent psychoform dissociation. The participants’ treating clinicians provided participants’ demographic details and mental health diagnoses. We found that 41% of participants reported high levels of psychoform dissociation and 21% reported high levels of somatoform dissociation. Both dissociation types were positively correlated. Neither was significantly related to participants’ age, gender, or mental health diagnoses. Participants with more than 1 Axis I mental health diagnosis had higher levels of somatoform dissociation than participants with only 1 or no Axis I mental health diagnosis. This study is the first to examine somatoform dissociation in Australian adolescents and enables initial international comparisons.     

Dissociative Identity Disorder Among Adolescents: Prevalence in a University Psychiatric Outpatient Unit

The aim of this study was to determine the prevalence of dissociative identity disorder (DID) and other dissociative disorders among adolescent psychiatric outpatients. A total of 116 consecutive outpatients between 11 and 17 years of age who were admitted to the child and adolescent psychiatry clinic of a university hospital for the 1st time were evaluated using the Adolescent Dissociative Experiences Scale, adolescent version of the Child Symptom Inventory-4, Childhood Trauma Questionnaire, and McMaster Family Assessment Device. All patients were invited for an interview with the Structured Clinical Interview for DSM-IV Dissociative Disorders (SCID-D) administered by 2 senior psychiatrists in a blind fashion. There was excellent interrater reliability between the 2 clinicians on SCID-D diagnoses and scores. Among 73 participants, 33 (45.2%) had a dissociative disorder: 12 (16.4%) had DID, and 21 (28.8%) had dissociative disorder not otherwise specified. There was no difference in gender distribution, childhood trauma, or family dysfunction scores between the dissociative and nondissociative groups. Childhood emotional abuse and family dysfunction correlated with self-reported dissociation. Of the dissociative adolescents, 93.9% had an additional psychiatric disorder. Among them, only separation anxiety disorder was significantly more prevalent than in controls. Although originally designed for adults, the SCID-D is promising for diagnosing dissociative disorders in adolescents, its modest congruence with self-rated dissociation and lack of relationship between diagnosis and childhood trauma and family dysfunction suggest that the prevalence rates obtained with this instrument originally designed for adults must be replicated. The introduction of diagnostic criteria for adolescent DID in revised versions of the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, would refine the assessment of dissociative disorders in this age group.     

Childhood Traumatic Experiences and Dissociative Phenomena in Eating Disorders: Level and Association with the Severity of Binge Eating Symptoms

The aim of the current study is to evaluate the presence of childhood trauma, psychoform, and somatoform dissociation in eating disorders (ED). Eighty-six ED outpatients participated in this study, 20 of them were diagnosed with restrictive anorexia (AN-R), 10 of them with anorexia nervosa binge-purging subtypes (AN-B), 25 with bulimia nervosa (BN), and 31 with binge eating disorder (BED). They were matched by sex and age with a control group consisting of 86 healthy subjects (HC). Traumatic experiences were assessed by means of the Childhood Trauma Questionnaire (CTQ), psychological, and somatoform dissociation, respectively, by means of the Dissociative Experience Scale (DES-II) and Somatoform Dissociation Questionnaire (SDQ-20), and binge eating symptoms by means of Binge Eating Scale (BES). ED subjects showed higher levels of childhood trauma, and both psychoform and somatoform dissociation compared to HC subjects. ED patients showed higher levels of childhood trauma compared to the HC group. No significant differences were shown between ED subgroups with respect to all forms of childhood trauma. BN and AN-B subgroups showed higher levels of both psychological and somatoform dissociation. Dissociation and childhood trauma predicted the severity of binge eating symptoms. Our results confirm previous studies in the same field.     

Validity and reliability of a Persian version of the Dissociative Experiences Scale II (DES-II) on Iranian patients diagnosed with schizophrenia and mood disorders

ABSTRACT

Dissociative Experiences Scale (DES) is a valid self-reported tool to evaluate both non-pathological and pathological dissociative experiences. This study aims at evaluating the psychometric properties of a Persian version of the DES-II on both non-clinical samples and patients with schizophrenia and mood disorders. The back-translated DES-II was administered to 370 individuals being divided into three groups (270 healthy subjects, 50 patients with mood disorders, and 50 patients with schizophrenia) recruited from Shahid Beheshti Hospital of Kerman Medical University. The results showed a good reliability (Cronbach’s alpha = 0.95), a very high item-total correlation, and a good internal consistency of 0.892 measured by split half. Moreover, the Persian version of the DES-II questionnaire demonstrated convergent validity of the scale. Analyses of the DES-II subscales revealed significant differences for amnesic experiences, absorption/imaginative involvement, and depersonalization/derealization among healthy individuals, and patients with mood disorders as well as schizophrenia. We also found significant differences among only schizophrenia group but not mood disorders group in comparison with healthy individuals (p value = .0001, and 0.70, respectively), and between patients with schizophrenia and patients with mood disorders (p value = .03) using DES-T. As a conclusion, the Persian version of the DES-II is an appropriate, reliable, and valid tool to screen dissociative experiences and discriminate subcomponents of dissociative disorders in the Iranian population.     

Characteristics of Child Maltreatment,Psychological Dissociation,and Somatoform Dissociation of Canadian Inmates

ABSTRACT

Data are presented on childhood maltreatment characteristics, psychological dissociation, somatoform dissociation, and offense types with a sample of 93 Canadian inmates (62 males and 31 females), with a mean age of 34 years (SD = 9.5). The present study includes findings based on the Child Maltreatment Interview Schedule-Short Form (CMIS-SF), the Detailed Assessment of Posttraumatic States (DAPS), the Multidimensional Dissociation Inventory (MDI), the Somatoform Dissociation Questionnaire (SDQ-20), and indices of violent and sexual offending during adulthood. Chi-square, Cohen's d, and regression analyses were conducted with the data. Results showed that women reported more childhood sexual abuse (CSA) than men, and men committed more violent and sexual offenses than women. Mean comparisons using Cohen's d statistic showed that inmates (N = 62) reported more trauma-related dissociation (DAPS) and more MDI dissociation compared to normative data for these instruments; however, inmates had lower somatoform dissociation scores when compared to published means of dissociative disorder, somatoform disorder, and eating-disorder patients. Inmates with CSA histories had higher SDQ-20 scores than those who did not. No differences were found between sex offenders and non-sex offenders in terms of probable PTSD, probable DID, MDI scales, or the SDQ-20. CSA that involved penetration predicted MDI dissociation and also predicted later sexual offending. Of the MDI scales, derealization and memory disturbance predicted sexual offending. Neither MDI scales nor any of the CMIS-SF maltreatment types predicted violent offending. Results are discussed in terms of treatment implications for incarcerated individuals with histories of child maltreatment.     

MMPI profile characteristics of women with varying levels of normal dissociation.

MMPI-2 correlates of normal dissociation as measured by the absorption subscale items of the Dissociative Experiences Scale (DES) were examined in patients with diagnoses in the dissociative spectrum (n = 119) and not in the dissociative spectrum (n = 97). All patients completed the MMPI-2 and DES and were assigned to subgroups based on a cut-off score of 30 on normal dissociation. Results indicated that normal dissociation was unusually prominent among patients with mental disorders. The MMPI profiles of those with high imbalances of normal dissociation were skewed in the direction of more pathology across a broad range of mental symptoms. This was true for both dissociative and nondissociative patients. These findings provide preliminary evidence that high imbalances in normal dissociation may be related to psychopathology of a general nature.     

Dissociative Depression Among Women with Fibromyalgia or Rheumatoid Arthritis

The aim of this study was to inquire about the possible relations of childhood trauma, anger, and dissociation to depression among women with fibromyalgia or rheumatoid arthritis. Fifty female patients diagnosed as having fibromyalgia (n = 30) or rheumatoid arthritis (n = 20) participated in the study. The Childhood Trauma Questionnaire, Somatoform Dissociation Questionnaire (SDQ), Dissociation Questionnaire (DIS-Q), Beck Depression Inventory (BDI), Spielberger State-Trait Anger Expression Inventory, and Dissociative Disorders Interview Schedule were administered to all participants. Women with a lifetime diagnosis of depressive disorder had higher scores for somatoform and psychoform dissociation than the nondepressive patients. However, childhood trauma scores did not differ between the 2 groups. In regression analysis, current severity of depression (BDI) was predicted by psychoform dissociation (DIS-Q) and lower education, and lifetime diagnosis of major depression was predicted by somatoform dissociation (SDQ). Whereas childhood emotional neglect predicted somatoform dissociation, psychoform dissociation was predicted by childhood sexual abuse. Mental processing of anger seems to be 1 of the dimensions of psychodynamics in trauma-related depressive conditions. In the context of the perceived threat of loss of control due to expressed anger and mental disintegration, somatoform dissociation seems to contribute to overmodulation of emotions in dissociative depression. Among patients suffering from physical illness with possible psychosomatic dimensions, assessment of somatoform dissociation in addition to psychoform dissociation may be helpful to understand diverse psychopathological trajectories emerging in the aftermath of childhood adversities. The recently proposed category of “dissociative depression” (Sar, 2011) seems to be a promising concept for future research on psychosomatic aspects of traumatic stress.     

Dissociation and Schizophrenia

ABSTRACT

The authors administered the Dissociative Experiences Scale (DES), the Dissociative Disorders Interview Schedule (DDIS), the Scale for the Assessment of Positive Symptoms, and the Scale for Assessment of Negative Symptoms to 60 participants with schizophrenia. Participants were divided into two groups: those with scores below 10 on the DES and no dissociative disorder on the DDIS; and those with scores above 25 on the DES and/or a dissociative disorder on the DDIS. The dissociative participants had more severe trauma histories, more comorbidity and higher scores for both positive and negative symptoms. The authors interpret their findings as evidence in support of a trauma-dissociation subgroup within schizophrenia.     

Somatoform disorders among first-time referrals to a neurology service

Consecutive new neurology inpatients and outpatients (N=198) were assessed for somatoform disorders by using the Schedules for Clinical Assessment in Neuropsychiatry. Sixty-one percent of the patients (59% of the female patients and 63% of the male patients) had at least one medically unexplained symptom, and 34.9% fulfilled the diagnostic criteria for an ICD-10 somatoform disorder (27.7% of the male patients, 41.3% of the female patients, 20.5% of the inpatients, and 43.2% of the outpatients). The prevalence figures were about the same when DSM-IV criteria for somatoform disorders were used. Of the patients with a somatoform disorder, 60.5% also had another mental disorder. Somatization disorder, somatoform autonomic dysfunction, pain disorder, and neurasthenia were equally prevalent (6%-7%); dissociative (conversion) disorders and undifferentiated somatoform disorders were found in 2-3% of the patients. Fifty percent of the patients with somatoform disorders were identified by the neurologists.     

Dissociation,Psychiatric Symptoms,and Personality Traits in a Non-Clinical Population

ABSTRACT

This study investigated the relationship between dissociation and psychiatric symptoms as well as between dissociation and personality traits in a student population using the Dissociative Experiences Scale (DES), the Brief Symptom Inventory (BSI), and the Eysenck Personality Questionnaire (EPQ). The results indicate a strong association between dissociation and psychiatric symptoms in general as well as an association between dissociation and neuroticism. Both associations are primarily mediated through more benign forms of dissociation. Additionally, phobic anxiety and paranoid ideation from the BSI were found to account for 52.5% of the variance in DES-scores. Two components of dissociation, psychological and somatoform, as well as the relevance of considering both cognitive and affective factors in the dissociative process are discussed.     

The psychometric characteristics of the traumatic experiences checklist (TEC): first findings among psychiatric outpatients

The objective of the study was to assess the reliability and validity of a retrospective self‐report measure of potential traumatic experiences among psychiatric outpatients. The range of evaluated experiences includes emotional neglect and abuse. Participants completed the Traumatic Experiences Checklist (TEC) (N = 153), a self‐report trauma questionnaire of known psychometric qualities, i.e. the Stressful Life Experiences Questionnaire (SLESQ), and self‐report measures of somatoform dissociation (SDQ‐20), psychoform dissociation (DES). A majority (N = 115) completed the TEC twice, and also completed a measure of posttraumatic stress symptoms (PTSD‐ss). The TEC's internal consistency and test–retest reliability were good, and the TEC strongly correlated with the SLESQ. Associations between the TEC and the PTSD‐ss, DES, and SDQ‐20 supported the criterion‐related validity of the TEC. The internal consistency, test–retest reliability and criterion‐related validity of TEC trauma area presence and severity scores were also satisfactory. Preliminary findings suggest that the psychometric characteristics of the TEC are good. Future study of the TEC should include larger samples of psychiatric patients, as well as non‐clinical groups. Copyright © 2002 John Wiley & Sons, Ltd.